Btaudio

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Important.png Note: The correct title of this article is btaudio. It appears incorrectly here due to technical restrictions.



For a more generic overview of TV audio-over-PCI, including other (non-bttv) analog cards, see PCI TV audio



btaudio is a kernel module for reading the audio directly from Brook Tree bttv supported TV-cards. This may or may not work on your TV-card depending on chipset and used features by the card manufacturer. Give it a try if you want.

btaudio provides an OSS interface. For an ALSA driver, see snd-bt87x. In Debian (2006-02-14) this module is used automagically and the following is unecessary.

This is for Gentoo, so this will be a little strange to some. :)

To get btaudio working with ATI TV Wonder, put the following lines into /etc/modules.d/bttv.

alias sound-slot-1      btaudio
alias sound-service-1-0 btaudio

Also add btaudio to /etc/modules.autoload/kernel-2.6.

Then run modules-update.

For a Fedora setup add the following lines to /etc/modules.conf.

alias sound-slot-1      btaudio
alias sound-service-1-0 btaudio

pre-install btaudio modprobe via82cxxx_audio

The pre-install line makes sure that the sound card driver is loaded before the btaudio, so that btaudio will always get /dev/dsp1 and /dev/dsp2.

Also load the btaudio module from the /etc/rc.d/rc.local file with the following command.

/sbin/modprobe btaudio

In MythTV, setup your device /dev/video0 with /dev/dsp1 for the sound, and it might just work!

For auto-loading by Alsa, you can do the following:

alias snd-btaudio btaudio
alias sound-slot-1 snd-btaudio
alias sound-service-1-0 snd-btaudio

Alsa basically just looks for anything beginning with "snd-", and nobody really wants to load btaudio using rc.local. This works great and gives status on boot-up through Alsa.

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